Fold the bottom left and right edges to meet at the center crease, forming a kite shape.
You now have a 3D origami mouse that can sit on its own. Other "Mouse" Options
Fold the pointed top corner down to meet the center point of the bottom edges.
A 15x15 cm (6x6 inch) sheet is standard, but any size works. Optional: A pen to draw eyes on the finished mouse. Step-by-Step Folding Instructions
Fold the sharpest point in to make the nose, or leave it long to serve as the tail.
Fold one side up diagonally, then unfold and refold it down (rabbit ear fold) to make one ear. Repeat on the other side.